Z-Mode technology instantly reads elevation change relative to position. Measures in feet and meters. Scan Mode - fast ranging 4x per second for quick distance readings. One button design to power range and measure change. All-glass optical system brings more light to the eye. Fully multi-coated optics with ultra-wide band coatings. 6x Magnification and 24mm Objective lens. Reads range up to 2550 feet. Accuracy to +/- 3foot IPX4 Rated water resistant. Includes 3V CR2 battery.